SCALING EQUATION OF STATE FOR FERROELECTRIC TRIGLYCINE SELENATE AT T-APPROXIMATE-TO-T(C)

Digital data of polarization vs. field on triglycine selenate at closely spaced temperature intervals (DELTAT almost-equal-to 0.015) in the vicinity of the quasi-tricritical point of triglycine selenate have been collected. These data fulfill very well the scaling equation of state e -/+ = -/+ p + + (1/5)p5 (where e- and e+ correspond to T < T(c) and T > T(c), respectively) where p = = (P(s)/P(so))/{1 - T/T(c)}1/4 and e = (E/E(so))/{1 - T/T(c)}5/4 are the scaling variables, with tricritical exponents beta = 1/4, delta = 5.